A new method is demonstrated for using concentrated oxygen (O₂ gas) to release seed dormancy. Concentrated O₂ gas in air is known to release seed dormancy in some seeds, including some foxtail (Setaria) species. New medical equipment makes O₂ gas easier to work with than before, so laboratories working with dormant seeds can now use concentrated O₂ gas as a seed treatment on a production basis. Use of medical O₂ gas concentrators is simpler and safer than using O₂ gas supplied by pressurized gas cylinders. Suitable medical O₂ gas concentrators in new or used condition are readily available, operate on standard electrical current, and deliver O₂ gas with low-pressure tubes and fittings. Resealable plastic bags are inflated with concentrated O₂ gas and then sealed as seed treatment chambers. This use of concentrated O₂ gas is confirmed to significantly increase the germination of dormant seeds of giant foxtail (Setaria faberi Herrm) and plains bristlegrass (S. macrostachya Kunth).